On Sun, 13 Sep 2020 20:07:27 +0100
Bruno Haible wrote:
> Continuing this thread from May 2019
> <https://lists.gnu.org/archive/html/bug-make/2019-05/msg00022.html>:
> The problem was:
>
> How can a rule that generates multiple files be formulated so
> that it works with parallel make?
>
> For example, a rule that invokes bison, or a rule that invokes
> a different Makefile. For simplicity, here, use a rule that
> creates 4 files copy1, copy2, copy3, copy4.
>
> ===========================================
> all : copy1 copy2 copy3 copy4
>
> copy1 copy2 copy3 copy4: Makefile
> install -c -m 644 Makefile copy1
> install -c -m 644 Makefile copy2
> install -c -m 644 Makefile copy3
> install -c -m 644 Makefile copy4
> ===========================================
I would say there are two obvious solutions to make this work with parallel
make:
1) Allow the targets to be tuilt in paralllel:
===========================================
all : copy1 copy2 copy3 copy4
copy1 copy2 copy3 copy4: Makefile
install -c -m 644 Makefile $@
===========================================
However, this solution 1 will not work for a single command that generates
multiple files, so we might need a solution 2:
2) Don't mention some of the extra targets:
===========================================
all : copy1
copy1: Makefile
install -c -m 644 Makefile copy1
install -c -m 644 Makefile copy2
install -c -m 644 Makefile copy3
install -c -m 644 Makefile copy4
===========================================
regards Henrik
